public class Calculation implements Calculate{
    @Override
    public double plus(double a, double b) {
        return a+b;
    }

    @Override
    public double sub(double a, double b) {
        return a-b;
    }

    @Override
    public double mat(double a, double b) {
        return a*b;
    }

    @Override
    public double div(double a, double b) {
        return a/b;
    }
}
